3721865 has 16 divisors (see below), whose sum is σ = 5225088. Its totient is φ = 2491776.

The previous prime is 3721859. The next prime is 3721873. The reversal of 3721865 is 5681273.

It is a happy number.

It is not a de Polignac number, because 3721865 - 2⁴ = 3721849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 269 + ... + 2741.

It is an arithmetic number, because the mean of its divisors is an integer number (326568).

Almost surely, 2^3721865 is an apocalyptic number.

3721865 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3721865 is a deficient number, since it is larger than the sum of its proper divisors (1503223).

3721865 is a wasteful number, since it uses less digits than its factorization.

3721865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2528.

The product of its digits is 10080, while the sum is 32.

The square root of 3721865 is about 1929.2135703441. The cubic root of 3721865 is about 154.9721073639.

The spelling of 3721865 in words is "three million, seven hundred twenty-one thousand, eight hundred sixty-five".